Quallion

"Quallion, the leading Li-ion custom battery manufacturer... Quallion, LLC has the broadest and deepest understanding of lithium ion chemistry and has a long history as a primary and rechargeable cell battery manufacturer for use in the medical, military and aerospace industries."

They're so cool they have a flashy website full of fancy graphics - that doesn't work. Makes it hard to find out more when you click on a link and it does nothing.